The term phoresis is derived from the Greek word meaning “to carry.” In this type of symbiotic relationship, the phoront, usually the smaller organism, is mechanically carried by the other, usually larger, organism, the host. Unlike commensalism, there is no dependency in the procurement of food by either partner. Phoresis is a form of symbiosis in which no physiological interaction or dependency is involved. Both commensalism and phoresis can be considered spatial, rather than physiologic, relationships. Examples of phoresis arc the numerous sedentary protozoans, algae, and fungi that attach to the bodies of aquatic arthropods, turtles, and so on.